パララックス関連JSをピックアップ！
Jarallax
skrollr
Simple Parallax Scroll
Scrolly
https://github.com/Victa/scrolly
http://lab.victorcoulon.fr/javascript/scrolly/
Create a Parallax Scrolling Website Using Stellar.js
jInvertScroll
Parallax Content Slider with CSS3 and jQuery
Sliding Horizontal Parallax
